Where to dig?

“With vertical thinking one may reach a conclusion by a valid series of steps. Because of the soundness of the steps one is arrogantly certain of the correctness of the conclusion. But no matter how correct the path may be, the starting point was a matter of perceptual choice which fashioned the basic concepts used… …Lateral thinking is needed to handle the perceptual choice which is itself beyond the reach of vertical thinking… …You cannot dig a hole in a different place by digging the same hole deeper. Vertical thinking is used to dig the same hole deeper. Lateral thinking is used to dig a hole in a different place… …It is not just that vertical thinking alone is insufficient for progress… but that by itself it can be very dangerous.”

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